How to memorize the structure of polysaccharides

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.